Light And Sound QUESTIONS AND ANSWERS :: part16 : 1 to 5
Following Light And Sound Multiple choice objective type questions and answers will help you in many competitive written examinations and inteview 2017 like SSC exams :
1.The frequency of sound more than 20kHz are called …………….. sound |
| noise |
| music |
| hearing |
| none |
2.The frequencies less than 20 vibrations per second are …………… sounds |
| inaudible |
| audible |
| ultrasonic |
| none |
3.Optic fibre is a device based on the principle of ……………. |
| reflection |
| total internal reflection |
| reflection |
| none |
More Light And Sound QUESTIONS AND ANSWERS available in next pages
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